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JavaScript

var rgbString =  "rgb(0, 70, 255)";
var RGBAString = "rgba(0, 70, 255, 0.5)";

var rgbRegex = /^rgb\((\d+),\s*(\d+),\s*(\d+)\)$/; 
//need help on this regex
//I figure it needs to be ^rgba?, and then also an optional clause to handle the opacity

var partsRGB = rgbString.match(rgbRegex); 
var partsRGBA = RGBAString.match(rgbRegex);

console.log(partsRGB); //["rgb(0, 70, 255)", "0", "70", "255"]
console.log(partsRGBA); //null. I want ["rgb(0, 70, 255, 0.5)", "0", "70", "255", "0.5"]

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